“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

Leica's naming conventions actually tell you quite a lot once you know them, just like Canon's. Let's take a SUMMICRON-M 50mm f/2.0 for example. "Summ-" lets us know it's a double Gauss (aka Planar) design, "-cron" lets us know it's a mid-speed lens, and "-M" tells us it's got a fingertip focusing tab and the focal length engraved near the mount.

Leica.overgaard.dk seems to disagree with your definition. Summicron was derived from Leicas use of crown glass for the first time.
ALL Summicrons are f2 maximum aperture.
-M says it's an M mount lens not an R or reflex lens

Leica.overgaard.dk seems to disagree with your definition. Summicron was derived from Leicas use of crown glass for the first time.
ALL Summicrons are f2 maximum aperture.
-M says it's an M mount lens not an R or reflex lens

Some of you may be familiar with Aki-Asahi camera covers. One thing that you get for free when you order from them is a "practice kit" along with the kit you actually ordered. Well, I have two of these practice kits, obviously unused; one is for a Yashica FX-3 and the other is for a Yashica FX-D. I will send either or both your way, just for the cost of postage, to anywhere in the US.